SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/for-developers-query-events

QueryAllEventsNativeAPI.cs

using System.Collections.Generic;
using System.Linq;
using Telerik.Sitefinity.Events.Model;
using Telerik.Sitefinity.Modules.Events;

namespace SitefinityWebApp
{
    public class QueryAllEventsNativeAPI
    {
        private List<Event> GetAllEventsNativeAPI()
        {
            EventsManager eventsManager = EventsManager.GetManager();
            return eventsManager.GetEvents().Where(ev => ev.Status == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live).ToList();
        }
    }
}